(You may deal with APK files every day, whether it's installing and uninstalling effective tools, plug-ins, interesting games, etc... Have you ever known what these APK files are that accompany you every day? How to repair them? For example: Chinese version, repair function, repair text description, remove advertisement, etc. This article introduces the basic knowledge, framework, unpacking, packaging and signing of APK files, as well as the regular repair of APK files.)